Nothing, since its Sirius that pays Ronnie.
And its a lot. The contract specify 24/7 free limo service. So Ronnie's company gets payed 24/7.

The bodyguard stuff that Ronnie does: This maybe Howard pays. When Ronnie is with Howard on AGT, its AGT that pays Ronnie. (just look at the film contract that Howard signed: It was specified how much Ronnie would be payed. That Ralph would be payed and even the Wig lady. )